Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.
The specific endpoint at `/api/resource/16` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises a uniform $0.02/request price across all its endpoints. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what `/api/resource/16` specifically returns. The lack of documentation makes it difficult to determine the actual functionality behind this particular endpoint or any of the listed APIs.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without API key management
- —Agent-driven workflows that need on-demand data or AI inference with crypto micropayments
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers or agents wanting keyless, pay-as-you-go API access on Base
- —x402 protocol experimentation and integration testing
- —Low-friction micropayment API consumption without subscriptions
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume use cases where $0.02/request adds up and bulk pricing is preferred
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/resource/16 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of `/api/resource/16` specifically is unknown — only a generic 'Premium API Access' label is provided. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or output schema provided; request and response formats are unknown.
- —The specific functionality of /api/resource/16 is undocumented; 'Premium API Access' is the only descriptor.
- —The broader platform lists many endpoints (AI, finance, data, utils) but none have documented input/output contracts.
Citations
- —Uniform pricing of $0.02 per request across all endpointshttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units USDC on Base with 300s timeouthttps://lowpaymentfee.com/api/resource/16
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/resource/16
- —Platform lists endpoints for analytics, AI, finance, crypto, and utilitieshttps://lowpaymentfee.com